mirror of
https://github.com/google/brotli.git
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140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/* Copyright 2015 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "./huffman.h"
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#include "./state.h"
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#include <stdlib.h>
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#include <string.h>
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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void BrotliStateInit(BrotliState* s) {
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s->state = BROTLI_STATE_UNINITED;
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s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NONE;
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s->substate_tree_group = BROTLI_STATE_TREE_GROUP_NONE;
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s->substate_context_map = BROTLI_STATE_CONTEXT_MAP_NONE;
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s->substate_uncompressed = BROTLI_STATE_UNCOMPRESSED_NONE;
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s->substate_huffman = BROTLI_STATE_HUFFMAN_NONE;
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s->substate_decode_uint8 = BROTLI_STATE_DECODE_UINT8_NONE;
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s->loop_counter = 0;
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s->pos = 0;
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s->block_type_trees = NULL;
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s->block_len_trees = NULL;
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s->ringbuffer = NULL;
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s->context_map = NULL;
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s->context_modes = NULL;
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s->dist_context_map = NULL;
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s->context_map_slice = NULL;
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s->dist_context_map_slice = NULL;
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s->literal_hgroup.codes = NULL;
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s->literal_hgroup.htrees = NULL;
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s->insert_copy_hgroup.codes = NULL;
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s->insert_copy_hgroup.htrees = NULL;
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s->distance_hgroup.codes = NULL;
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s->distance_hgroup.htrees = NULL;
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s->custom_dict = NULL;
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s->custom_dict_size = 0;
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s->is_last_metablock = 0;
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s->window_bits = 0;
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s->max_distance = 0;
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s->dist_rb[0] = 16;
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s->dist_rb[1] = 15;
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s->dist_rb[2] = 11;
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s->dist_rb[3] = 4;
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s->dist_rb_idx = 0;
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s->block_type_trees = NULL;
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s->block_len_trees = NULL;
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/* Make small negative indexes addressable. */
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s->symbol_lists = &s->symbols_lists_array[BROTLI_HUFFMAN_MAX_CODE_LENGTH + 1];
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s->mtf_upper_bound = 255;
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}
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void BrotliStateMetablockBegin(BrotliState* s) {
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s->meta_block_remaining_len = 0;
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s->block_length[0] = 1 << 28;
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s->block_length[1] = 1 << 28;
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s->block_length[2] = 1 << 28;
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s->num_block_types[0] = 1;
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s->num_block_types[1] = 1;
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s->num_block_types[2] = 1;
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s->block_type_rb[0] = 1;
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s->block_type_rb[1] = 0;
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s->block_type_rb[2] = 1;
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s->block_type_rb[3] = 0;
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s->block_type_rb[4] = 1;
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s->block_type_rb[5] = 0;
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s->context_map = NULL;
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s->context_modes = NULL;
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s->dist_context_map = NULL;
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s->context_map_slice = NULL;
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s->literal_htree_index = 0;
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s->literal_htree = NULL;
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s->dist_context_map_slice = NULL;
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s->dist_htree_index = 0;
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s->context_lookup1 = NULL;
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s->context_lookup2 = NULL;
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s->literal_hgroup.codes = NULL;
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s->literal_hgroup.htrees = NULL;
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s->insert_copy_hgroup.codes = NULL;
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s->insert_copy_hgroup.htrees = NULL;
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s->distance_hgroup.codes = NULL;
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s->distance_hgroup.htrees = NULL;
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}
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void BrotliStateCleanupAfterMetablock(BrotliState* s) {
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BROTLI_FREE(s->context_modes);
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BROTLI_FREE(s->context_map);
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BROTLI_FREE(s->dist_context_map);
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BrotliHuffmanTreeGroupRelease(&s->literal_hgroup);
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BrotliHuffmanTreeGroupRelease(&s->insert_copy_hgroup);
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BrotliHuffmanTreeGroupRelease(&s->distance_hgroup);
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s->literal_hgroup.codes = NULL;
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s->literal_hgroup.htrees = NULL;
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s->insert_copy_hgroup.codes = NULL;
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s->insert_copy_hgroup.htrees = NULL;
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s->distance_hgroup.codes = NULL;
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s->distance_hgroup.htrees = NULL;
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}
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void BrotliStateCleanup(BrotliState* s) {
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BROTLI_FREE(s->context_modes);
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BROTLI_FREE(s->context_map);
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BROTLI_FREE(s->dist_context_map);
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BrotliHuffmanTreeGroupRelease(&s->literal_hgroup);
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BrotliHuffmanTreeGroupRelease(&s->insert_copy_hgroup);
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BrotliHuffmanTreeGroupRelease(&s->distance_hgroup);
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BROTLI_FREE(s->ringbuffer);
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BROTLI_FREE(s->block_type_trees);
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}
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#if defined(__cplusplus) || defined(c_plusplus)
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} /* extern "C" */
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#endif
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